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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1769ba53b4b9a6f7287935bae71909eddd988db576fcfae2ea3d6283cbeeb23e' 
  AND token = 'AaWD9UnXRdgPREOuNgqoEpHvBTc2ZMFoU1k5fd+EqGo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00075

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}